תפלות doesn’t mean shtus… It means immorality, and if it weren’t a big deal, the rambam wouldn’t use the expression “tzivu chachamim”.
The bedieved applies to torah shebichsav, which the rambam says is not keilu melamda tiflus – but lechatchila even that he says not to. We’re in a bedieved situation, so the gedolim held that torah she bichsav is alright and even important in our times.
This distinction, in an open rambam, is somehow lost on the many discussions that are had about this issue